Hi Ian and welcome!
You have selected a great scope to start with. I have a 12" solid tube GSO which is essentially the same scope.
The Bintel 9mm is a plossl so it offers a 50deg apparent field of view and gives power of 166x in your scope. If budget is tight, it makes a reasonable higher power EP to complement the 26mm that comes with the scope, but be aware that eye relief is fairly tight at 6mm so bot the easiest to use.
I wouldn't go spending much money on EPs as the 26mm will show you a lot. When I first got my scope I used the 25mm plossl that came withit maybe 90% of the time.
I would recommend you read up on collimation. A good refrence to start with is here,
http://www.astro-baby.com/collimatio...on%20guide.htm
Malcolm